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| Oued Namous 001 | |||||||||||||||||||||||||||||||||||
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| Basic information | Name: Oued Namous 001 This is an OFFICIAL meteorite name. Abbreviation: ON 001 Observed fall: No Year found: 2021 Country: Algeria Mass:  1402 g | ||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 40 approved meteorites classified as Angrite. [show all] Search for other: Achondrites, Angrites | ||||||||||||||||||||||||||||||||||
| Comments: | Approved 1 Oct 2022 | ||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 111:
Oued Namous 001 (ON 001) 32°00’40.73"N, 00°21’46.17"W Bechar, Algeria Find: 2021 Classification: Angrite History: This meteorite was found approximately 15 km east of a major dry riverbed Wadi Al-Namous (aka Oued Namous) and approximately 10 km north of highway N6B in El Bayadh Province, Algeria, in May 2021. Eight pieces plus many fragments weighing a total of 1402 g were purchased by Mark Lyon in 2022. Physical characteristics: Dark colored exterior covered in patches of smooth fusion crust. Broken surfaces and saw-cut surfaces reveal a fine-grained mosaic of black, green and white colored crystals with scattered gemmy green olivine phenocrysts up to 8 mm in diameter. Spherical vugs are ubiquitous. Petrography: (C. Agee and A. Ross, UNM) Reflected light microscopy and electron microprobe analysis showed a subophitic texture of Al-Ti bearing high-calcium pyroxenes (with separate populations of Al-Ti bearing diopside-hedenbergite and Al-Ti bearing hedenbergite), euhedral elongate to stubby anorthite, olivine, kirschsteinite, and minor titanomagnetite and troilite. No metal was detected. Vesicular fusion crust was 100-300 μm thick. Ferromagnesian phases showed core to rim compositional zonation. Olivine showed a positive correlation between calcium content and fayalite content. Geochemistry: (A. Ross and C. Agee, UNM) Al-Ti bearing salite-ferrosalite Fs22.1±3.0Wo51.1±1.3, Fe/Mn=84±6, Al2O3 (wt%)=6.7±1.6, TiO=1.3±0.3 (wt%), n=6; Al-Ti bearing hedenbergite Fs45.4±3.4Wo51.6±1.3, Fe/Mn=136±14, Al2O3=6.0±1.8 (wt%), TiO=3.0±1.0 (wt%), n=5; olivine Fa58.8±19.0Lrn5.6±2.1, range Fa32.3-87.6, Fe/Mn=86±12, n=15; kirschsteinite Fa61.1±2.4Lrn34.4±1.6, Fe/Mn=73±2, n=4; plagioclase An99.7±0.2, n=6; fusion crust (20 μm defocused beam) SiO2=36.5±0.1, TiO2=1.1±0.1, Al2O3=7.4±0.1, Cr2O3=0.06±0.02, MgO=7.5±0.1, FeO=30.0±0.2, MnO=0.33±0.02, CaO=14.1±0.2 (all wt%). Classification: This is a volcanic angrite based on the significant igneous zoning of olivine and pyroxene. Evidence supporting the angrite classification include the presence of: 1) plagioclase An>99; 2) Al-Ti bearing high-calcium pyroxenes with Fe/Mn up to 149; 3) kirschsteinite; 4) olivine with Fe/Mn up to 111; and 5) spherical vugs typical of volcanic angrites. Specimens: 22.5 g on deposit at UNM, Mark Lyon holds seven pieces at 865 g plus 230 g of smaller fragments, Luc Labenne holds a single stone of 307 g. | ||||||||||||||||||||||||||||||||||
| Data from: MB111 Table 0 Line 0: |
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| Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012) |
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| References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:
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Statistics: This is 1 of 31 approved meteorites from Bechar, Algeria (plus 1 unapproved name) This is 1 of 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||||||
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